Calculation Method of Milling Allowance of Door Frame Contour Based on Measured Data

Abstract

The invention discloses a cabin door frame contour milling allowance measuring and calculating method based on measured data. The method comprises the steps of obtaining measured cabin door frame surface three-dimensional point cloud data through three-dimensional scanning equipment; preprocessing the actually measured cabin door frame surface three-dimensional point cloud data; extracting an actually measured data intersection point and a positioning hole circle center; performing coarse-to-fine registration on the actually measured three-dimensional data and a CAD digital model based on a cabin door intersection point and positioning hole characteristics; calculating an actually measured cabin door frame contour point; and calculating the Euclidean distance from a contour point of the actually measured frame to the CAD digital model after registration, wherein the distance is the theoretical milling allowance of a cabin door frame. According to the method, the milling allowance of the contour point of the cabin door frame can be accurately calculated, parts are guided to be accurately machined, and therefore the accurate assembly of an airplane cabin door is achieved.

Description

technical field [0001] The invention relates to the technical field of aerospace measurement, in particular to a method for measuring and calculating the milling allowance of a cabin door frame outline based on actual measurement data. Background technique [0002] Aircraft is an important vehicle for transportation and operations in the aerospace field. The door frame is a part of the aircraft’s largest component body. When making the door frame, it is necessary to calculate the milling allowance for the initially processed frame and input it to the CNC machine tool for milling. Excess metal is used to achieve precise assembly. However, the calculation of milling allowances is mostly done manually. Measuring the milling allowances around each reference point requires a large amount of measurement work, inaccurate positioning, and low measurement accuracy, which can easily lead to wrong measurements. Multiple times of milling and cutting are required, and the size and materi...

AI Technical Summary

Problems solved by technology

[0002] Aircraft is an important vehicle for transportation and operations in the aerospace field. The door frame is a part of the aircraft’s largest component body. When making the door frame, it is necessary to calculate the milling allowance for the initially processed frame and input it to the CNC machine tool for milling. Excess metal is used to achieve precise assembly. However, the calculation of milling allowances is mostly done manually. Measuring the milling allowances around each reference point requires a large amount of measurement work, inaccurate positioning, and low measurement accuracy, which can easily lead to wrong measurements. Multiple times of milling and cutting are required, and the size and material of the frame make it difficult to mill and cut the hatch, which wastes manpower and material resources

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